package demo2;

import java.util.ArrayList;
import java.util.List;

/**
 * Created with IntelliJ IDEA.
 * Description:
 * User: Administrator
 * Date: 2023-07-07
 * Time: 12:09
 */
public class Test {
    public static List<List<Integer>> generate(int numRows){
        List<List<Integer>> ret = new ArrayList<>();
        List<Integer> list = new ArrayList<>();
        list.add(1);
        ret.add(list);
        for (int i = 1; i <numRows ; i++) {
            List<Integer> curRow = new ArrayList<>();
            curRow.add(1);

            List<Integer> preRow = ret.get(i-1);
            for (int j = 1; j < i; j++) {
                int val = preRow.get(j)+preRow.get(j-1);
                curRow.add(val);
            }

            curRow.add(1);
            ret.add(curRow);
        }
        return ret;
    }
    public static void main(String[] args) {
        //Test test = new Test();
        List<List<Integer>> ret =generate(5);
        System.out.println(ret);
    }
}
